7845

iTrader: (1)

my fuel system is 2- 255 walboros fed with -6 into -8 with a magnafuel 1:1 regulator. i have motron 60s. im using an autometer fuel PSI guage. my pumps are wired with 10 guage and on their own relay. im using the stock wiring to to activate the new 40amp relay.

now i notice my fuel system bleeds off just as fast as it pumps up when i key the ignition. now my problem when i go to start the truck it will fire and i can play with throttle to get it to run for a few seconds. then it fire, after about the 4th time it will fire as long as i hold the throttle WOT. then after all this the truck is extremely rich for a few seconds till all teh raw fuel is burned out.


why are pumps bleeding off, arent they suppose to hold pressure for little while? once truck is running it holds steady at the commanded fuel psi

FICINJECTORS

iTrader: (30)

sounds like you have an injector stuck open, we can service them for $15 each if we can save them.

If not we have the Siemens 60's for $54 each + a flat $11.60 shipping.

7845

iTrader: (1)

you think injector? someone had mentioned that since i didnt install a check valve, so my fuel is bleeding off and not keeping the pressure it needs apond start up.

my injectors were new but i guess one could be bad

FICINJECTORS

iTrader: (30)

if one or more is stuck open they can drop pressure really fast, the extremely rich on startup is what says to me that its a stuck injector, since it would be leaking into the cylinder

7845

iTrader: (1)

how could i check to see?

FICINJECTORS

iTrader: (30)

hook up a gauge to the rail, turn the key on, pump comes on and pressurizes the rail, turn the key off, see if the pressure drops off

7845

iTrader: (1)

i have an autometer guage to my regulator. thats how i can see the pressure dropping. i orderd a check valve and going to install that to see if that works. also going to drop tank and see if any connections are loose

FICINJECTORS

iTrader: (30)

if the pump is allowing fuel to bleed off and back out of the feed line, that could very well do it, but the fact its extremely rich sounds like a stuck injector to me.

7845

iTrader: (1)

well i checked my system found a few clamps lose in the tank. i installed a check valve in the feed line and it still bleeds off. im now on the belieft its the injectors as you stated FICINJECTORs. cause on start up the truck is extremely rich till it burns the fuel out

now how is it possible new injectors are acting like this?

FICINJECTORS

iTrader: (30)

Depending on what injectors they are, it can be very likely. Some injectors just wont work with the 4 bar pressure of the LS, some are just crappy, and some can be a manufacturers defect.

What brand and size are they?

7845

iTrader: (1)

they are black. motron 60s

FICINJECTORS

iTrader: (30)

Siemen's 60's are a very very good injector, and they will work fine at 4 bar.

How old are they? Who did the tune? They will be a 69lb injector @ 4 bar.

I don't want to condemn these, but if you run out of options we can clean, service, and flow test them for $15 each to make sure they are performing correctly.

I would go that route instead of buying another set.

7845

iTrader: (1)

i thought at our fuel psi they are 73s. see how things go i might pull them out in near future and see which are leaking.